package opera;

import book.Book;
import book.BookList;

import java.util.Scanner;

public class DelOperation implements IOperation{
    @Override
    public void work(BookList booklist) {
        System.out.println("删除图书！");
        System.out.println("请输入要删除的图书：");
        Scanner scanner = new Scanner(System.in);
        String name = scanner.nextLine();
        int currentSize = booklist.getUsedSize();
        //设置index用来接收要删除的书的下标，将其初始化为-1，用来防止
        int index = -1;
        for (int i = 0; i < currentSize; i++) {
            Book tmp = booklist.getBook(i);
            if (tmp.getName().equals(name)){
                index = i;
                break;
            }
        }
        //挪动数据
        for (int j = index; j < currentSize-1; j++) {
            Book book = booklist.getBook(j+1);
            booklist.setBook(j,book );
        }
        //修改usedSize
        booklist.setUsedSize(currentSize-1);
        //因为删除的是对象，所以 把最后一个设置为null
        booklist.setBook(currentSize-1,null);
        System.out.println("删除成功！");

    }


}
